638200071 has 12 divisors (see below), whose sum is σ = 953632680. Its totient is φ = 410795280.

The previous prime is 638200039. The next prime is 638200093. The reversal of 638200071 is 170002836.

638200071 is a `hidden beast` number, since 638 + 20 + 0 + 0 + 7 + 1 = 666.

It is not a de Polignac number, because 638200071 - 2⁵ = 638200039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638200571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1222345 + ... + 1222866.

It is an arithmetic number, because the mean of its divisors is an integer number (79469390).

Almost surely, 2^638200071 is an apocalyptic number.

638200071 is a deficient number, since it is larger than the sum of its proper divisors (315432609).

638200071 is a wasteful number, since it uses less digits than its factorization.

638200071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2445246 (or 2445243 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 638200071 is about 25262.6220135599. The cubic root of 638200071 is about 860.9652363274.

The spelling of 638200071 in words is "six hundred thirty-eight million, two hundred thousand, seventy-one".